seed contamination

例句：

1. 1.The contamination of the soil by pesticides is a major concern for farmers.
   农药对土壤的污染是农民们的主要担忧。
2. 2. The contamination of water sources with pollutants poses a serious threat to public health.
   水源受到污染物的污染，对公共健康构成严重威胁。
3. 3. The contamination of food by chemicals is a growing concern in today's society.
   食品中化学物质的污染是当今社会日益关注的问题。